Author

HELCOM RED LIST Biotope Expert Team

Textual description

Baltic
bottoms in the photic zone with at least 90 % coverage of coarse sediment.
Coarse sediment has less than 20 % of mud/silt/clay fraction (<63 µm), and
the proportion of gravel and pebbles (grain size 2–63 mm) exceeds 30% of the
combined gravel and sand fraction . Emergent vegetation covers least 10 %
of the seabed and more than other perennial attached erect groups. Out of the
emergent vegetation, sedges constitutes at least 50 % of the biovolume.